



	This is a program to read and set the battery operated clock on 
	the AT&T 6300 PC.  It is useful when the version of MS-DOS is not
	one by AT&T.

	The source is written in TURBO C, and it has been tested with both
	version 1.0 and 1.5.

	To set the DOS time from the battery-operated clock when you boot
	your computer, include this line in your AUTOEXEC.BAT file:

	[path]ATTCLOCK [-v]

	You may need to specify a path if ATTCLOCK.COM is not in your root
	directory.  The -V option tells it to work in verbose mode.

	The calling sequence is:

	    ATTCLOCK [switches]

	The following are valid switches, and should be preceeded by a '-':

	    i - information only, does not change clock or DOS date-time.
	    h - list of options.
	    r - reset clock (zeros seconds and re-initializes clock).
	    s - sets clock date-time from DOS date-time.
	    v - verbose mode, says what's going on.
	    w - wait until seconds = 0, so clock get sets exactly.

	Note that options -i and -s may be combined to output the
	current DOS date and time.


	In order to set the battery-operated clock, you must first set the
	DOS date and time using the DATE and TIME commands.  Then type

	    ATTCLOCK -s

	This has worked well for me with one exeception:  About three times
	in the last five months my system as hung while booting.  I'm not
	sure why this happens but it must have something to do with the clock,
	since if I boot from a floppy which does have a call to ATTCLOCK in
	the AUTOEXEC.BAT file and then use ATTCLOCK to set the time, I can
	then reboot normally again.  (By the way, my system has IBM PC-DOS
	version 3.2 running).

	Good luck!

					Jonathan Senning
					University of Virginia

					jrs2p@bellman.acc.virginia.edu
